Whose career was not showered in glory,
When he just couldn’t say . . . |
The simple definition of "metadata" (or "meta data") is that it is "data about data". The truth is far more complex and
subtle than that. But companies are now discovering that they must come to terms with it.
David Hay wrote five articles for TDAN.com in 2001-2002, describing the specific nature of metadata, presenting an extensive data
model of their structure.
A Repository Model -- The Analysis Model
A Repository Model -- The Relational Design Model
A Repository Model -- The Object-oriented Design Model
A Repository Model -- Business Rules (Structural Assertions and Derivations)
A Repository Model -- Business Rules (Action Assertions)
Then in 2004, he described the model from the point of view of business rules and what can and cannot be shown in a data model.
What Data Models can do with Business Rules
What Data Models cannot do with Business Rules
The Business Constraint Model
Data Driven Business Rules
He has also rendered the OMG "Common Warehouse Metamodel" into a notation that makes it a bit more accessible.
Bibliography
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